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通过快速结晶法制得了2.875％C+1.3％Cr的白口铸铁粉末。然后用热等静压方法在温度720℃,压力150MPa将粉末压3h得到了高密度的粉末压块。压块经63％的变形后,显微组织由晶粒尺寸为1～3μm的铁素体和直径小于3.5μm的渗碳体颗粒组成。在670～770℃的温度区间和3×10~(-4)～1~(s-1)的应变速率范围,对材料在热等静压后和热等静压+63％的墩粗变形后的超塑性行为进行了研究。研究结果表明:材料在720℃和3×10~(-3)～3×10~(-2s-1)的应变速率下显示出低的流动应力和高的应变速率敏感性(m=0.42)。
A white cast iron powder of 2.875% C + 1.3% Cr was obtained by rapid crystallization. Then hot isostatic pressing method at a temperature of 720 ° C, a pressure of 150MPa powder pressure 3h get high-density powder compact. After 63% deformation of the compact, the microstructure consists of ferrite with a grain size of 1 to 3 μm and cementite grains with a diameter of less than 3.5 μm. In the temperature range of 670 ~ 770 ℃ and the strain rate of 3 × 10 ~ (-4) ~ 1 ~ (s-1), the hot deformation of the material after hot isostatic pressing and hot isostatic pressing + 63% After the superplastic behavior was studied. The results show that the material shows low flow stress and high strain rate sensitivity (m = 0.42) at 720 ℃ and strain rate of 3 × 10 -3 ~ 3 × 10 -2 s -1, .